<!DOCTYPE HTML>
<html lang="zh-CN">


<head>
    <meta charset="utf-8">
    <meta name="keywords" content="react的第一个程序, wujie">
    <meta name="description" content="无解的技术博客">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
    <meta name="renderer" content="webkit|ie-stand|ie-comp">
    <meta name="mobile-web-app-capable" content="yes">
    <meta name="format-detection" content="telephone=no">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
    <!-- Global site tag (gtag.js) - Google Analytics -->


    <title>react的第一个程序 | 无解</title>
    <link rel="icon" type="image/png" href="/favicon.png">

    <link rel="stylesheet" type="text/css" href="/libs/awesome/css/all.css">
    <link rel="stylesheet" type="text/css" href="/libs/materialize/materialize.min.css">
    <link rel="stylesheet" type="text/css" href="/libs/aos/aos.css">
    <link rel="stylesheet" type="text/css" href="/libs/animate/animate.min.css">
    <link rel="stylesheet" type="text/css" href="/libs/lightGallery/css/lightgallery.min.css">
    <link rel="stylesheet" type="text/css" href="/css/matery.css">
    <link rel="stylesheet" type="text/css" href="/css/my.css">

    <script src="/libs/jquery/jquery.min.js"></script>
    
<meta name="generator" content="Hexo 4.2.0"><link rel="stylesheet" href="/css/prism-tomorrow.css" type="text/css"></head>


<body>
    <header class="navbar-fixed">
    <nav id="headNav" class="bg-color nav-transparent">
        <div id="navContainer" class="nav-wrapper container">
            <div class="brand-logo">
                <a href="/" class="waves-effect waves-light">
                    
                    <img src="/medias/logo.png" class="logo-img" alt="LOGO">
                    
                    <span class="logo-span">无解</span>
                </a>
            </div>
            

<a href="#" data-target="mobile-nav" class="sidenav-trigger button-collapse"><i class="fas fa-bars"></i></a>
<ul class="right nav-menu">
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/" class="waves-effect waves-light">
      
      <i class="fas fa-home" style="zoom: 0.6;"></i>
      
      <span>首页</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/tags" class="waves-effect waves-light">
      
      <i class="fas fa-tags" style="zoom: 0.6;"></i>
      
      <span>标签</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/categories" class="waves-effect waves-light">
      
      <i class="fas fa-bookmark" style="zoom: 0.6;"></i>
      
      <span>分类</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/archives" class="waves-effect waves-light">
      
      <i class="fas fa-archive" style="zoom: 0.6;"></i>
      
      <span>归档</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/about" class="waves-effect waves-light">
      
      <i class="fas fa-user-circle" style="zoom: 0.6;"></i>
      
      <span>关于</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/friends" class="waves-effect waves-light">
      
      <i class="fas fa-address-book" style="zoom: 0.6;"></i>
      
      <span>友情链接</span>
    </a>
    
  </li>
  
  <li>
    <a href="#searchModal" class="modal-trigger waves-effect waves-light">
      <i id="searchIcon" class="fas fa-search" title="搜索" style="zoom: 0.85;"></i>
    </a>
  </li>
</ul>

<div id="mobile-nav" class="side-nav sidenav">

    <div class="mobile-head bg-color">
        
        <img src="/medias/logo.png" class="logo-img circle responsive-img">
        
        <div class="logo-name">无解</div>
        <div class="logo-desc">
            
            无解的技术博客
            
        </div>
    </div>

    

    <ul class="menu-list mobile-menu-list">
        
        <li class="m-nav-item">
	  
		<a href="/" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-home"></i>
			
			首页
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/tags" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-tags"></i>
			
			标签
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/categories" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-bookmark"></i>
			
			分类
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/archives" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-archive"></i>
			
			归档
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/about" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-user-circle"></i>
			
			关于
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/friends" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-address-book"></i>
			
			友情链接
		</a>
          
        </li>
        
        
    </ul>
</div>

        </div>

        
    </nav>

</header>

    



<div class="bg-cover pd-header post-cover" style="background-image: url('/medias/featureimages/5.jpg')">
    <div class="container" style="right: 0px;left: 0px;">
        <div class="row">
            <div class="col s12 m12 l12">
                <div class="brand">
                    <h1 class="description center-align post-title">react的第一个程序</h1>
                </div>
            </div>
        </div>
    </div>
</div>




<main class="post-container content">

    
    <link rel="stylesheet" href="/libs/tocbot/tocbot.css">
<style>
    #articleContent h1::before,
    #articleContent h2::before,
    #articleContent h3::before,
    #articleContent h4::before,
    #articleContent h5::before,
    #articleContent h6::before {
        display: block;
        content: " ";
        height: 100px;
        margin-top: -100px;
        visibility: hidden;
    }

    #articleContent :focus {
        outline: none;
    }

    .toc-fixed {
        position: fixed;
        top: 64px;
    }

    .toc-widget {
        width: 345px;
        padding-left: 20px;
    }

    .toc-widget .toc-title {
        margin: 35px 0 15px 0;
        padding-left: 17px;
        font-size: 1.5rem;
        font-weight: bold;
        line-height: 1.5rem;
    }

    .toc-widget ol {
        padding: 0;
        list-style: none;
    }

    #toc-content {
        height: calc(100vh - 250px);
        overflow: auto;
    }

    #toc-content ol {
        padding-left: 10px;
    }

    #toc-content ol li {
        padding-left: 10px;
    }

    #toc-content .toc-link:hover {
        color: #42b983;
        font-weight: 700;
        text-decoration: underline;
    }

    #toc-content .toc-link::before {
        background-color: transparent;
        max-height: 25px;
        
        position: absolute;
        right: 23.5vw;
        display: block;
    }

    .toc-fixed .toc-link::before{
        position: fixed!important;/*当toc的位置改为fixed时，.toc-link::before也要改为fixed*/
    }

    #toc-content .is-active-link {
        color: #42b983;
    }

    #toc-content .is-active-link::before {
        background-color: #42b983;
    }

    #floating-toc-btn {
        position: fixed;
        right: 15px;
        bottom: 76px;
        padding-top: 15px;
        margin-bottom: 0;
        z-index: 998;
    }

    #floating-toc-btn .btn-floating {
        width: 48px;
        height: 48px;
    }

    #floating-toc-btn .btn-floating i {
        line-height: 48px;
        font-size: 1.4rem;
    }
</style>
<div class="row">
    <div id="main-content" class="col s12 m12 l9">
        <!-- 文章内容详情 -->
<div id="artDetail">
    <div class="card">
        <div class="card-content article-info">
            <div class="row tag-cate">
                <div class="col s7">
                    
                    <div class="article-tag">
                        
                            <a href="/tags/React/">
                                <span class="chip bg-color">React</span>
                            </a>
                        
                    </div>
                    
                </div>
                <div class="col s5 right-align">
                    
                    <div class="post-cate">
                        <i class="fas fa-bookmark fa-fw icon-category"></i>
                        
                            <a href="/categories/%E5%89%8D%E7%AB%AF/" class="post-category">
                                前端
                            </a>
                        
                    </div>
                    
                </div>
            </div>

            <div class="post-info">
                
                <div class="post-date info-break-policy">
                    <i class="far fa-calendar-minus fa-fw"></i>发布日期:&nbsp;&nbsp;
                    2020-04-10
                </div>
                

                
                <div class="post-date info-break-policy">
                    <i class="far fa-calendar-check fa-fw"></i>更新日期:&nbsp;&nbsp;
                    2020-04-10
                </div>
                

                
                <div class="info-break-policy">
                    <i class="far fa-file-word fa-fw"></i>文章字数:&nbsp;&nbsp;
                    993
                </div>
                

                

                
                    <div id="busuanzi_container_page_pv" class="info-break-policy">
                        <i class="far fa-eye fa-fw"></i>阅读次数:&nbsp;&nbsp;
                        <span id="busuanzi_value_page_pv"></span>
                    </div>
				
            </div>

        </div>
        <hr class="clearfix">
        <div class="card-content article-card-content">
            <div id="articleContent">
                <h2 id="React安装"><a href="#React安装" class="headerlink" title="React安装"></a>React安装</h2><h3 id="Create-React-App"><a href="#Create-React-App" class="headerlink" title="Create React App"></a>Create React App</h3><p><code>Create React App</code>时一个用于学习<code>React</code>的环境，也是用<code>React</code>创建新的单页应用的最佳方式</p>
<ul>
<li>Node &gt;= 8.1.0</li>
<li>npm &gt;= 5.6</li>
</ul>
<p>创建项目请执行：</p>
<pre class=" language-bash"><code class="language-bash">npx create-react-app react1
<span class="token function">cd</span> react1
<span class="token function">npm</span> start</code></pre>
<blockquote>
<p><code>npx</code>是<code>npm5.2+</code>附带的<code>package</code>运行工具</p>
</blockquote>
<h2 id="第一个React程序"><a href="#第一个React程序" class="headerlink" title="第一个React程序"></a>第一个React程序</h2><blockquote>
<p>从头开始了解一个框架语言，就先把它自动生成的东西全删了，自己实现一遍</p>
</blockquote>
<ol>
<li>将<code>src</code>目录下的所有<code>js</code>文件删除</li>
<li>新建一个<code>index.js</code>文件，程序照样能够执行的起来</li>
<li>进行编码</li>
</ol>
<blockquote>
<p>引入<code>react</code>关键的库</p>
</blockquote>
<pre class=" language-react"><code class="language-react">import React from 'react';
import ReactDOM from 'react-dom';</code></pre>
<blockquote>
<p>使用<code>ReactDOM</code>的<code>render</code>方法进行页面输出</p>
</blockquote>
<pre class=" language-react"><code class="language-react">ReactDOM.render()</code></pre>
<p>原理的实现方法：</p>
<p>创建一个简单的<code>react</code>元素</p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token keyword">const</span> app <span class="token operator">=</span> <span class="token operator">&lt;</span>h1<span class="token operator">></span>Welcome React<span class="token operator">!</span><span class="token operator">!</span><span class="token operator">!</span><span class="token operator">&lt;</span><span class="token operator">/</span>h1<span class="token operator">></span><span class="token punctuation">;</span></code></pre>
<blockquote>
<p>将之传入<code>render</code>里，第二个参数是找到根的<code>div</code>,文件在<code>public/index.html</code>里</p>
</blockquote>
<pre class=" language-javascript"><code class="language-javascript">ReactDOM<span class="token punctuation">.</span><span class="token function">render</span><span class="token punctuation">(</span>
    app<span class="token punctuation">,</span>
    document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'#root'</span><span class="token punctuation">)</span>
<span class="token punctuation">)</span></code></pre>
<hr>
<p>使用函数来简化操作：</p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token keyword">const</span> createApp <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token operator">&lt;</span>h1<span class="token operator">></span>Welcome React<span class="token operator">!</span><span class="token operator">!</span><span class="token operator">!</span><span class="token operator">&lt;</span><span class="token operator">/</span>h1<span class="token operator">></span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> app <span class="token operator">=</span> <span class="token function">createApp</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

ReactDOM<span class="token punctuation">.</span><span class="token function">render</span><span class="token punctuation">(</span>
    app<span class="token punctuation">,</span>
    document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'#root'</span><span class="token punctuation">)</span>
<span class="token punctuation">)</span></code></pre>
<hr>
<p>如果存在多个<code>html</code>标签：</p>
<p>这是一个正常的原理的实现过程</p>
<p><code>props</code>：参数传递</p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token keyword">const</span> createApp <span class="token operator">=</span> <span class="token punctuation">(</span>props<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token punctuation">(</span>
        <span class="token operator">&lt;</span>div<span class="token operator">></span>
         <span class="token punctuation">{</span><span class="token comment" spellcheck="true">/* 只要在jsx里插入js的代码，就加一层花括号，注释也是js，所以注释也加花括号 */</span><span class="token punctuation">}</span>
         <span class="token operator">&lt;</span>h1<span class="token operator">></span>welcome <span class="token punctuation">{</span>props<span class="token punctuation">.</span>title<span class="token punctuation">}</span><span class="token operator">&lt;</span><span class="token operator">/</span>h1<span class="token operator">></span>
         <span class="token operator">&lt;</span>p<span class="token operator">></span>优秀的<span class="token punctuation">{</span>props<span class="token punctuation">.</span>title<span class="token punctuation">}</span><span class="token operator">&lt;</span><span class="token operator">/</span>p<span class="token operator">></span>
       <span class="token operator">&lt;</span><span class="token operator">/</span>div<span class="token operator">></span>    
    <span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> app <span class="token operator">=</span> <span class="token function">createApp</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    title<span class="token punctuation">:</span> <span class="token string">'react 16.13'</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

ReactDOM<span class="token punctuation">.</span><span class="token function">render</span><span class="token punctuation">(</span>
    app<span class="token punctuation">,</span>
    document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'#root'</span><span class="token punctuation">)</span>
<span class="token punctuation">)</span></code></pre>
<hr>
<p>创建组件的第一种方式：使用箭头函数，但是这个名字要大写开始</p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token keyword">const</span> App <span class="token operator">=</span> <span class="token punctuation">(</span>props<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token punctuation">(</span>
      <span class="token operator">&lt;</span>div<span class="token operator">></span>
        <span class="token punctuation">{</span><span class="token comment" spellcheck="true">/* 只要在jsx里插入js的代码，就加一层花括号，注释也是js，所以注释也加花括号 */</span><span class="token punctuation">}</span>
        <span class="token operator">&lt;</span>h1<span class="token operator">></span>welcome <span class="token punctuation">{</span>props<span class="token punctuation">.</span>title<span class="token punctuation">}</span><span class="token operator">&lt;</span><span class="token operator">/</span>h1<span class="token operator">></span>
        <span class="token operator">&lt;</span>p<span class="token operator">></span>优秀的<span class="token punctuation">{</span>props<span class="token punctuation">.</span>title<span class="token punctuation">}</span><span class="token operator">&lt;</span><span class="token operator">/</span>p<span class="token operator">></span>
      <span class="token operator">&lt;</span><span class="token operator">/</span>div<span class="token operator">></span>
  <span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

ReactDOM<span class="token punctuation">.</span><span class="token function">render</span><span class="token punctuation">(</span>
    <span class="token operator">&lt;</span>App title<span class="token operator">=</span><span class="token string">"1901"</span> <span class="token operator">/</span><span class="token operator">></span><span class="token punctuation">,</span>
    document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'#root'</span><span class="token punctuation">)</span>
<span class="token punctuation">)</span></code></pre>
<h2 id="JSX原理"><a href="#JSX原理" class="headerlink" title="JSX原理"></a>JSX原理</h2><pre class=" language-javascript"><code class="language-javascript"><span class="token keyword">import</span> React<span class="token punctuation">,</span> <span class="token punctuation">{</span>Component<span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'react'</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> ReactDOM <span class="token keyword">from</span> <span class="token string">'react-dom'</span><span class="token punctuation">;</span>

<span class="token comment" spellcheck="true">// 表示一个虚拟DOM树的方式</span>
<span class="token comment" spellcheck="true">//const appVDom = {</span>
<span class="token comment" spellcheck="true">//   tag: 'div',</span>
<span class="token comment" spellcheck="true">//   attrs: {</span>
<span class="token comment" spellcheck="true">//     className: 'app',</span>
<span class="token comment" spellcheck="true">//     id: 'appRoot'</span>
<span class="token comment" spellcheck="true">//   },</span>
<span class="token comment" spellcheck="true">//   children: [</span>
<span class="token comment" spellcheck="true">//     {</span>
<span class="token comment" spellcheck="true">//       tags: 'h1',</span>
<span class="token comment" spellcheck="true">//       attrs: {</span>
<span class="token comment" spellcheck="true">//         className: 'title'</span>
<span class="token comment" spellcheck="true">//       },</span>
<span class="token comment" spellcheck="true">//       children: [</span>
<span class="token comment" spellcheck="true">//           'JSX原理'</span>
<span class="token comment" spellcheck="true">//       ]</span>
<span class="token comment" spellcheck="true">//     },</span>
<span class="token comment" spellcheck="true">//     {</span>
<span class="token comment" spellcheck="true">//       tag: 'h1',</span>
<span class="token comment" spellcheck="true">//       attrs: null,</span>
<span class="token comment" spellcheck="true">//       children: [</span>
<span class="token comment" spellcheck="true">//           '类组件时继承React.Component的'</span>
<span class="token comment" spellcheck="true">//       ]</span>
<span class="token comment" spellcheck="true">//     }</span>
<span class="token comment" spellcheck="true">//   ]</span>
<span class="token comment" spellcheck="true">// }</span>

<span class="token comment" spellcheck="true">// 这里是使用类的形式创建的组件，这是jsx的语法，但不是合法的js代码</span>
<span class="token comment" spellcheck="true">// class App extends Component {</span>
<span class="token comment" spellcheck="true">//   render() {</span>
<span class="token comment" spellcheck="true">//     return (</span>
<span class="token comment" spellcheck="true">//         &lt;div className="app" id="appRoot"></span>
<span class="token comment" spellcheck="true">//           &lt;h1 className="title">JSX原理&lt;/h1></span>
<span class="token comment" spellcheck="true">//           &lt;p>类组件时继承React.Component的&lt;/p></span>
<span class="token comment" spellcheck="true">//         &lt;/div></span>
<span class="token comment" spellcheck="true">//     )</span>
<span class="token comment" spellcheck="true">//   }</span>
<span class="token comment" spellcheck="true">// }</span>

<span class="token comment" spellcheck="true">// 所以react在真正的渲染的时候，会把上面的代码编译成下面的这个样子来运行，下面的代码就是合法的js代码</span>
<span class="token keyword">class</span> <span class="token class-name">App</span> <span class="token keyword">extends</span> <span class="token class-name">Component</span> <span class="token punctuation">{</span>
  <span class="token function">render</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token punctuation">(</span>
        React<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span>
            <span class="token string">'div'</span><span class="token punctuation">,</span>
            <span class="token punctuation">{</span>
              className<span class="token punctuation">:</span> <span class="token string">'app'</span><span class="token punctuation">,</span>
              id<span class="token punctuation">:</span> <span class="token string">'appRoot'</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span>
            React<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span>
                <span class="token string">'h1'</span><span class="token punctuation">,</span>
                <span class="token punctuation">{</span>
                  className<span class="token punctuation">:</span> <span class="token string">'title'</span>
                <span class="token punctuation">}</span><span class="token punctuation">,</span>
                <span class="token string">'jsx原理'</span>
            <span class="token punctuation">)</span><span class="token punctuation">,</span>
            React<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span>
                <span class="token string">'p'</span><span class="token punctuation">,</span>
                <span class="token keyword">null</span><span class="token punctuation">,</span>
                <span class="token string">'类组件是继承React.Component的'</span>
            <span class="token punctuation">)</span>
        <span class="token punctuation">)</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

ReactDOM<span class="token punctuation">.</span><span class="token function">render</span><span class="token punctuation">(</span>
    <span class="token operator">&lt;</span>App<span class="token operator">/</span><span class="token operator">></span><span class="token punctuation">,</span>
    document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'#root'</span><span class="token punctuation">)</span>
<span class="token punctuation">)</span></code></pre>
<blockquote>
<p>react.createElement是一个方法，用于创建元素，可以有很多的参数，前两个是固定的</p>
</blockquote>
<ul>
<li>第一个可以理解为标签名</li>
<li>第二个可以理解为标签的属性</li>
<li>剩下的，就继续写更多的子元素</li>
</ul>
<pre class=" language-react"><code class="language-react">React.createElement(type, [props], [...children])</code></pre>
<h2 id="styled-components样式组件的使用"><a href="#styled-components样式组件的使用" class="headerlink" title="styled-components样式组件的使用"></a>styled-components样式组件的使用</h2><p>安装：</p>
<pre class=" language-bash"><code class="language-bash"><span class="token function">npm</span> <span class="token function">install</span> styled-components -S</code></pre>
<p><strong><em>引入</em></strong></p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token keyword">import</span> styled <span class="token keyword">from</span> <span class="token string">'styled-components'</span><span class="token punctuation">;</span></code></pre>
<p><strong><em>创建样式组件</em></strong></p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token comment" spellcheck="true">// 样式组件</span>
<span class="token keyword">const</span> Title <span class="token operator">=</span> styled<span class="token punctuation">.</span>h1<span class="token template-string"><span class="token string">`
    color: #F00
  `</span></span></code></pre>
<p>使用<em>`</em>来写样式</p>
<h2 id="快捷键创建一个组件"><a href="#快捷键创建一个组件" class="headerlink" title="快捷键创建一个组件"></a>快捷键创建一个组件</h2><p><code>rcc</code>:创建一个类的组件</p>
<p><code>rfc</code>:创建一个函数式的组件</p>
<h2 id="组件化的目录结构方式"><a href="#组件化的目录结构方式" class="headerlink" title="组件化的目录结构方式"></a>组件化的目录结构方式</h2><ul>
<li>在<code>src</code>目录下创建<code>components</code>目录用于存放组件</li>
<li><code>components</code>目录下也可以新建很多目录，用于存放单个的组件</li>
<li>单个组件的目录下默认查找<code>index.js</code>，如果不写<code>index</code>,导出的时候需要再加上你设置的组件名称</li>
</ul>
<p><strong><em>简单示例</em></strong></p>
<pre><code>├── dist
├── node_modules
├── public
│   └── index.html
│   ├── logo.png
|    ├── robots.txt
├── src
│   ├── components
|    |    └── TodoHeader
|    |    |    └── index.js
|    |    ├── TodoInput
|    |    |    └── index.js
|    |    ├── TodoList
|    |    |    └── index.js
|    |    ├── index.js
|   ├── App.js
|    ├── index.js</code></pre><p><strong><em>src/components/index.js</em></strong></p>
<blockquote>
<p>方便用于导出所有的组件</p>
</blockquote>
<ol>
<li><p>第一种方式：</p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token comment" spellcheck="true">// 用于导出当前组件目录下的组件</span>
<span class="token keyword">import</span> TodoHeader <span class="token keyword">from</span> <span class="token string">'./TodoHeader'</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> TodoInput <span class="token keyword">from</span> <span class="token string">'./TodoInput'</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> TodoList <span class="token keyword">from</span> <span class="token string">'./TodoList'</span><span class="token punctuation">;</span>

<span class="token keyword">export</span> <span class="token punctuation">{</span>
   TodoHeader<span class="token punctuation">,</span>
   TodoInput<span class="token punctuation">,</span>
   TodoList
<span class="token punctuation">}</span></code></pre>
</li>
</ol>
<ol start="2">
<li><p>第二种方式：</p>
<pre class=" language-javascript"><code class="language-javascript"><span class="token comment" spellcheck="true">// 用于导出当前组件目录下的组件</span>

<span class="token keyword">export</span> <span class="token punctuation">{</span><span class="token keyword">default</span> <span class="token keyword">as</span> TodoHeader<span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./TodoHeader'</span>
<span class="token keyword">export</span> <span class="token punctuation">{</span><span class="token keyword">default</span> <span class="token keyword">as</span> TodoInput<span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./TodoInput'</span>
<span class="token keyword">export</span> <span class="token punctuation">{</span><span class="token keyword">default</span> <span class="token keyword">as</span> TodoList<span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./TodoList'</span></code></pre>
</li>
</ol>

            </div>
            <hr/>

            

    <div class="reprint" id="reprint-statement">
        
            <div class="reprint__author">
                <span class="reprint-meta" style="font-weight: bold;">
                    <i class="fas fa-user">
                        文章作者:
                    </i>
                </span>
                <span class="reprint-info">
                    <a href="http://wxvirus.gitee.io" rel="external nofollow noreferrer">virus</a>
                </span>
            </div>
            <div class="reprint__type">
                <span class="reprint-meta" style="font-weight: bold;">
                    <i class="fas fa-link">
                        文章链接:
                    </i>
                </span>
                <span class="reprint-info">
                    <a href="http://wxvirus.gitee.io/2020/04/10/react%E7%9A%84%E7%AC%AC%E4%B8%80%E4%B8%AA%E7%A8%8B%E5%BA%8F/">http://wxvirus.gitee.io/2020/04/10/react%E7%9A%84%E7%AC%AC%E4%B8%80%E4%B8%AA%E7%A8%8B%E5%BA%8F/</a>
                </span>
            </div>
            <div class="reprint__notice">
                <span class="reprint-meta" style="font-weight: bold;">
                    <i class="fas fa-copyright">
                        版权声明:
                    </i>
                </span>
                <span class="reprint-info">
                    本博客所有文章除特別声明外，均采用
                    <a href="https://creativecommons.org/licenses/by/4.0/deed.zh" rel="external nofollow noreferrer" target="_blank">CC BY 4.0</a>
                    许可协议。转载请注明来源
                    <a href="http://wxvirus.gitee.io" target="_blank">virus</a>
                    !
                </span>
            </div>
        
    </div>

    <script async defer>
      document.addEventListener("copy", function (e) {
        let toastHTML = '<span>复制成功，请遵循本文的转载规则</span><button class="btn-flat toast-action" onclick="navToReprintStatement()" style="font-size: smaller">查看</a>';
        M.toast({html: toastHTML})
      });

      function navToReprintStatement() {
        $("html, body").animate({scrollTop: $("#reprint-statement").offset().top - 80}, 800);
      }
    </script>



            <div class="tag_share" style="display: block;">
                <div class="post-meta__tag-list" style="display: inline-block;">
                    
                        <div class="article-tag">
                            
                                <a href="/tags/React/">
                                    <span class="chip bg-color">React</span>
                                </a>
                            
                        </div>
                    
                </div>
                <div class="post_share" style="zoom: 80%; width: fit-content; display: inline-block; float: right; margin: -0.15rem 0;">
                    <link rel="stylesheet" type="text/css" href="/libs/share/css/share.min.css">

<div id="article-share">
    
    
    <div class="social-share" data-sites="qq,qzone,wechat,weibo" data-wechat-qrcode-helper="<p>微信扫一扫即可分享！</p>"></div>
    <script src="/libs/share/js/social-share.min.js"></script>
    

    

</div>

                </div>
            </div>
            
        </div>
    </div>

    

    

    

    

    

    

    

<article id="prenext-posts" class="prev-next articles">
    <div class="row article-row">
        
        <div class="article col s12 m6" data-aos="fade-up">
            <div class="article-badge left-badge text-color">
                <i class="fas fa-chevron-left"></i>&nbsp;上一篇</div>
            <div class="card">
                <a href="/2020/04/11/react%E7%BB%84%E4%BB%B6%E7%9A%84%E6%95%B0%E6%8D%AE%E6%8C%82%E8%BD%BD/">
                    <div class="card-image">
                        
                        
                        <img src="/medias/featureimages/12.jpg" class="responsive-img" alt="react组件的数据挂载">
                        
                        <span class="card-title">react组件的数据挂载</span>
                    </div>
                </a>
                <div class="card-content article-content">
                    <div class="summary block-with-text">
                        
                            React组件的数据挂载props和prop-type安装prop-type
用于检测数据

npm install --save prop-type

函数式组件内的使用方式：

TodoHeader/index.js
import Re
                        
                    </div>
                    <div class="publish-info">
                        <span class="publish-date">
                            <i class="far fa-clock fa-fw icon-date"></i>2020-04-11
                        </span>
                        <span class="publish-author">
                            
                            <i class="fas fa-bookmark fa-fw icon-category"></i>
                            
                            <a href="/categories/%E5%89%8D%E7%AB%AF/" class="post-category">
                                    前端
                                </a>
                            
                            
                        </span>
                    </div>
                </div>
                
                <div class="card-action article-tags">
                    
                    <a href="/tags/React/">
                        <span class="chip bg-color">React</span>
                    </a>
                    
                </div>
                
            </div>
        </div>
        
        
        <div class="article col s12 m6" data-aos="fade-up">
            <div class="article-badge right-badge text-color">
                下一篇&nbsp;<i class="fas fa-chevron-right"></i>
            </div>
            <div class="card">
                <a href="/2020/04/07/ThinkPHP5-1%E6%B8%85%E9%99%A4%E7%BC%93%E5%AD%98%E5%8A%9F%E8%83%BD%E7%9A%84%E5%AE%9E%E7%8E%B0/">
                    <div class="card-image">
                        
                        
                        <img src="/medias/featureimages/22.jpg" class="responsive-img" alt="ThinkPHP5.1清除缓存功能的实现">
                        
                        <span class="card-title">ThinkPHP5.1清除缓存功能的实现</span>
                    </div>
                </a>
                <div class="card-content article-content">
                    <div class="summary block-with-text">
                        
                            ThinkPHP5.1 清除缓存第一种方法
在基类控制器里，写上clear()方法，到时候用于调用,在也不是JS里alert(&#39;清除缓存了&#39;)当然，5.1取消了CACHE_PATH TEMP_PATH常量，所以要定义这些缓存
                        
                    </div>
                    <div class="publish-info">
                            <span class="publish-date">
                                <i class="far fa-clock fa-fw icon-date"></i>2020-04-07
                            </span>
                        <span class="publish-author">
                            
                            <i class="fas fa-bookmark fa-fw icon-category"></i>
                            
                            <a href="/categories/%E5%90%8E%E7%AB%AF/" class="post-category">
                                    后端
                                </a>
                            
                            
                        </span>
                    </div>
                </div>
                
                <div class="card-action article-tags">
                    
                    <a href="/tags/PHP/">
                        <span class="chip bg-color">PHP</span>
                    </a>
                    
                    <a href="/tags/ThinkPHP/">
                        <span class="chip bg-color">ThinkPHP</span>
                    </a>
                    
                </div>
                
            </div>
        </div>
        
    </div>
</article>

</div>


<script>
    $('#articleContent').on('copy', function (e) {
        // IE8 or earlier browser is 'undefined'
        if (typeof window.getSelection === 'undefined') return;

        var selection = window.getSelection();
        // if the selection is short let's not annoy our users.
        if (('' + selection).length < Number.parseInt('120')) {
            return;
        }

        // create a div outside of the visible area and fill it with the selected text.
        var bodyElement = document.getElementsByTagName('body')[0];
        var newdiv = document.createElement('div');
        newdiv.style.position = 'absolute';
        newdiv.style.left = '-99999px';
        bodyElement.appendChild(newdiv);
        newdiv.appendChild(selection.getRangeAt(0).cloneContents());

        // we need a <pre> tag workaround.
        // otherwise the text inside "pre" loses all the line breaks!
        if (selection.getRangeAt(0).commonAncestorContainer.nodeName === 'PRE') {
            newdiv.innerHTML = "<pre>" + newdiv.innerHTML + "</pre>";
        }

        var url = document.location.href;
        newdiv.innerHTML += '<br />'
            + '来源: 无解<br />'
            + '文章作者: Virus<br />'
            + '文章链接: <a href="' + url + '">' + url + '</a><br />'
            + '本文章著作权归作者所有，任何形式的转载都请注明出处。';

        selection.selectAllChildren(newdiv);
        window.setTimeout(function () {bodyElement.removeChild(newdiv);}, 200);
    });
</script>


<!-- 代码块功能依赖 -->
<script type="text/javascript" src="/libs/codeBlock/codeBlockFuction.js"></script>

<!-- 代码语言 -->

<script type="text/javascript" src="/libs/codeBlock/codeLang.js"></script>


<!-- 代码块复制 -->

<script type="text/javascript" src="/libs/codeBlock/codeCopy.js"></script>


<!-- 代码块收缩 -->

<script type="text/javascript" src="/libs/codeBlock/codeShrink.js"></script>


<!-- 代码块折行 -->

<style type="text/css">
code[class*="language-"], pre[class*="language-"] { white-space: pre !important; }
</style>


    </div>
    <div id="toc-aside" class="expanded col l3 hide-on-med-and-down">
        <div class="toc-widget">
            <div class="toc-title"><i class="far fa-list-alt"></i>&nbsp;&nbsp;目录</div>
            <div id="toc-content"></div>
        </div>
    </div>
</div>

<!-- TOC 悬浮按钮. -->

<div id="floating-toc-btn" class="hide-on-med-and-down">
    <a class="btn-floating btn-large bg-color">
        <i class="fas fa-list-ul"></i>
    </a>
</div>


<script src="/libs/tocbot/tocbot.min.js"></script>
<script>
    $(function () {
        tocbot.init({
            tocSelector: '#toc-content',
            contentSelector: '#articleContent',
            headingsOffset: -($(window).height() * 0.4 - 45),
            collapseDepth: Number('0'),
            headingSelector: 'h2, h3, h4'
        });

        // modify the toc link href to support Chinese.
        let i = 0;
        let tocHeading = 'toc-heading-';
        $('#toc-content a').each(function () {
            $(this).attr('href', '#' + tocHeading + (++i));
        });

        // modify the heading title id to support Chinese.
        i = 0;
        $('#articleContent').children('h2, h3, h4').each(function () {
            $(this).attr('id', tocHeading + (++i));
        });

        // Set scroll toc fixed.
        let tocHeight = parseInt($(window).height() * 0.4 - 64);
        let $tocWidget = $('.toc-widget');
        $(window).scroll(function () {
            let scroll = $(window).scrollTop();
            /* add post toc fixed. */
            if (scroll > tocHeight) {
                $tocWidget.addClass('toc-fixed');
            } else {
                $tocWidget.removeClass('toc-fixed');
            }
        });

        
        /* 修复文章卡片 div 的宽度. */
        let fixPostCardWidth = function (srcId, targetId) {
            let srcDiv = $('#' + srcId);
            if (srcDiv.length === 0) {
                return;
            }

            let w = srcDiv.width();
            if (w >= 450) {
                w = w + 21;
            } else if (w >= 350 && w < 450) {
                w = w + 18;
            } else if (w >= 300 && w < 350) {
                w = w + 16;
            } else {
                w = w + 14;
            }
            $('#' + targetId).width(w);
        };

        // 切换TOC目录展开收缩的相关操作.
        const expandedClass = 'expanded';
        let $tocAside = $('#toc-aside');
        let $mainContent = $('#main-content');
        $('#floating-toc-btn .btn-floating').click(function () {
            if ($tocAside.hasClass(expandedClass)) {
                $tocAside.removeClass(expandedClass).hide();
                $mainContent.removeClass('l9');
            } else {
                $tocAside.addClass(expandedClass).show();
                $mainContent.addClass('l9');
            }
            fixPostCardWidth('artDetail', 'prenext-posts');
        });
        
    });
</script>

    

</main>



    <footer class="page-footer bg-color">
    
    <div class="container row center-align" style="margin-bottom: 0px !important;">
        <div class="col s12 m8 l8 copy-right">
            Copyright&nbsp;&copy;
            <span id="year">2020</span>
            <a href="http://wxvirus.gitee.io" target="_blank">Virus</a>
            |&nbsp;Powered by&nbsp;<a href="https://hexo.io/" target="_blank">Hexo</a>
            |&nbsp;Theme&nbsp;<a href="https://github.com/blinkfox/hexo-theme-matery" target="_blank">Matery</a>
            <br>
            
            &nbsp;<i class="fas fa-chart-area"></i>&nbsp;站点总字数:&nbsp;<span
                class="white-color">34.8k</span>&nbsp;字
            
            
            
            
            
            
            <span id="busuanzi_container_site_pv">
                |&nbsp;<i class="far fa-eye"></i>&nbsp;总访问量:&nbsp;<span id="busuanzi_value_site_pv"
                    class="white-color"></span>&nbsp;次
            </span>
            
            
            <span id="busuanzi_container_site_uv">
                |&nbsp;<i class="fas fa-users"></i>&nbsp;总访问人数:&nbsp;<span id="busuanzi_value_site_uv"
                    class="white-color"></span>&nbsp;人
            </span>
            
            <br>
            
            <br>
            
        </div>
        <div class="col s12 m4 l4 social-link social-statis">
    <a href="https://github.com/xinwangqilin" class="tooltipped" target="_blank" data-tooltip="访问我的GitHub" data-position="top" data-delay="50">
        <i class="fab fa-github"></i>
    </a>



    <a href="mailto:1418667580@qq.com" class="tooltipped" target="_blank" data-tooltip="邮件联系我" data-position="top" data-delay="50">
        <i class="fas fa-envelope-open"></i>
    </a>







    <a href="tencent://AddContact/?fromId=50&fromSubId=1&subcmd=all&uin=1418667580" class="tooltipped" target="_blank" data-tooltip="QQ联系我: 1418667580" data-position="top" data-delay="50">
        <i class="fab fa-qq"></i>
    </a>







</div>
    </div>
</footer>

<div class="progress-bar"></div>


    <!-- 搜索遮罩框 -->
<div id="searchModal" class="modal">
    <div class="modal-content">
        <div class="search-header">
            <span class="title"><i class="fas fa-search"></i>&nbsp;&nbsp;搜索</span>
            <input type="search" id="searchInput" name="s" placeholder="请输入搜索的关键字"
                   class="search-input">
        </div>
        <div id="searchResult"></div>
    </div>
</div>

<script src="/js/search.js"></script>
<script type="text/javascript">
$(function () {
    searchFunc("/" + "search.xml", 'searchInput', 'searchResult');
});
</script>
    <!-- 回到顶部按钮 -->
<div id="backTop" class="top-scroll">
    <a class="btn-floating btn-large waves-effect waves-light" href="#!">
        <i class="fas fa-arrow-up"></i>
    </a>
</div>


    <script src="/libs/materialize/materialize.min.js"></script>
    <script src="/libs/masonry/masonry.pkgd.min.js"></script>
    <script src="/libs/aos/aos.js"></script>
    <script src="/libs/scrollprogress/scrollProgress.min.js"></script>
    <script src="/libs/lightGallery/js/lightgallery-all.min.js"></script>
    <script src="/js/matery.js"></script>

    <!-- Baidu Analytics -->

    <!-- Baidu Push -->

<script>
    (function () {
        var bp = document.createElement('script');
        var curProtocol = window.location.protocol.split(':')[0];
        if (curProtocol === 'https') {
            bp.src = 'https://zz.bdstatic.com/linksubmit/push.js';
        } else {
            bp.src = 'http://push.zhanzhang.baidu.com/push.js';
        }
        var s = document.getElementsByTagName("script")[0];
        s.parentNode.insertBefore(bp, s);
    })();
</script>

    
    <script src="/libs/others/clicklove.js" async="async"></script>
    
    
    <script async src="/libs/others/busuanzi.pure.mini.js"></script>
    

    

    

    

    

    
    
    
    <script src="/libs/instantpage/instantpage.js" type="module"></script>
    

</body>

</html>
